CN104132423B - Control method and control device for liquid impact prevention for air conditioning system and air conditioning system - Google Patents
Control method and control device for liquid impact prevention for air conditioning system and air conditioning system Download PDFInfo
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- CN104132423B CN104132423B CN201410334959.9A CN201410334959A CN104132423B CN 104132423 B CN104132423 B CN 104132423B CN 201410334959 A CN201410334959 A CN 201410334959A CN 104132423 B CN104132423 B CN 104132423B
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Abstract
The invention provides a control method for liquid impact prevention for an air conditioning system. The air conditioning system comprises a compressor, a condenser and an electric expansion valve. The control method comprises the following steps that the surface temperature of the compressor and the surface temperature of the condenser are detected respectively, and the operation frequency of the compressor and the opening degree of the electric expansion valve are controlled according to the temperature difference between the surface temperature of the compressor and the surface temperature of the condenser. According to the control method for the liquid impact prevention for the air conditioning system, the compressor can be prevented from generating liquid impact and protected against damage, and the operation life of the air conditioning system is prolonged. The invention further provides a control device for the liquid impact prevention for the air conditioning system and the air conditioning system with the control device.
Description
Technical field
The present invention relates to technical field of electric appliances, particularly to a kind of control method of air-conditioning system liquid impact prevention and control dress
Put, and a kind of air-conditioning system with this control device.
Background technology
At present, conventional inverter air-conditioning system for compressor under some severe environmental conditions, due to not to compressor
Temperature T evaluated, compressor output coolant quantity flux matched with the heat exchange of evaporimeter unreasonable, easily occur evaporimeter steaming
Send out insufficient, produce a large amount of liquid refrigerants, be directly sucked in by compressor, be especially chronically under worst cold case, compressor displacement
Easily liquid hit phenomenon occurs, cause compressor damage.
Content of the invention
The purpose of the present invention is intended at least solve to a certain extent above-mentioned technical problem.
For this reason, it is an object of the present invention to proposing a kind of control method of air-conditioning system liquid impact prevention, this control method
Can avoid compressor that liquid hammer occurs, protect the compressor against damage, extend the service life of air-conditioning system.
Further object is that proposing a kind of control device of air-conditioning system liquid impact prevention.
Another object of the present invention is to propose a kind of air-conditioning system.
For reaching above-mentioned purpose, an aspect of of the present present invention embodiment proposes a kind of control method of air-conditioning system liquid impact prevention,
Described air-conditioning system includes compressor, condenser and electric expansion valve, and described control method comprises the following steps：Detect institute respectively
State the surface temperature of compressor and the surface temperature of described condenser；And the surface temperature according to described compressor and described cold
The temperature difference of the surface temperature of condenser is controlled to the running frequency of described compressor and the aperture of described electric expansion valve.
The control method of air-conditioning system liquid impact prevention according to embodiments of the present invention, by detecting the surface temperature example of compressor
As the surface temperature such as medium temperature of bottom temp and condenser, and then the table of the surface temperature according to compressor and condenser
Face temperature is controlled to the running frequency of compressor and the aperture of electric expansion valve, so that the coolant quantity of compressor output
With the exchange capability of heat Proper Match of evaporimeter, thus avoiding evaporator evaporation insufficient and then to be back to a large amount of liquid of compressor cold
Matchmaker, can avoid compressor that liquid hammer occurs, and then protect the compressor against damage, extend the service life of air-conditioning system.
Specifically, the surface temperature of the described surface temperature detecting described compressor respectively and described condenser, specifically may be used
To detect the bottom temp of described compressor, and the middle portion temperature detecting described condenser.
Further, in some embodiments of the invention, the described bottom temp according to compressor and described condenser
The temperature difference of middle portion temperature the running frequency of described compressor and the aperture of described electric expansion valve are controlled, concrete wrap
Include：If the temperature difference of the middle portion temperature of the bottom temp of described compressor and described condenser meets the first default protective condition,
The running frequency then controlling described compressor drops to first frequency, and controls the aperture of described electric expansion valve to be decreased to first
Aperture.
Wherein, drop to described first frequency in the running frequency controlling described compressor and control described electric expansion valve
Aperture be decreased to described first aperture Preset Time after, if in the bottom temp of described compressor and described condenser
The temperature difference of portion's temperature still meets the described first default protective condition, then control described compressor out of service.
Specifically, if the temperature difference satisfaction second of the middle portion temperature of the bottom temp of described compressor and described condenser is pre-
If protective condition, then control the running frequency of described compressor to drop to second frequency, and control opening of described electric expansion valve
Degree is reduced with first rate, and wherein, described second frequency is more than described first frequency.
In addition, if the temperature difference of the middle portion temperature of the bottom temp of described compressor and described condenser meets the 3rd presetting
Protective condition, then control the running frequency of described compressor constant, and controls the aperture of described electric expansion valve with the second speed
Reduce, wherein, described second speed is less than described first rate.
Wherein, in some embodiments of the invention, controlling the aperture of described electric expansion valve with described first rate
When reducing or control the aperture of described electric expansion valve to reduce with described second speed, the bottom temp of described compressor and described
The temperature difference of the middle portion temperature of condenser increases, then control described electric expansion valve to keep current aperture.
Specifically, the described first default protective condition is -8 DEG C≤Δ T≤0 DEG C, and the described second default protective condition is 0 DEG C
<Δ T≤A DEG C, the described 3rd default protective condition is A DEG C<Δ T≤B DEG C, wherein, Δ T be described compressor bottom temp and
The temperature difference of the middle portion temperature of described condenser, A<B.
Wherein, described A can be 2-3 DEG C, and described B can be 4-5 DEG C.
For reaching above-mentioned purpose, another aspect of the present invention embodiment proposes a kind of control dress of air-conditioning system liquid impact prevention
Put, wherein, described air-conditioning system includes compressor, condenser and electric expansion valve, and described control device includes：Temperature detection
Device, described temperature detector detects the surface temperature of described compressor and the surface temperature of described condenser respectively；Controller, institute
State the fortune to described compressor for the temperature difference according to the surface temperature of described compressor and the surface temperature of described condenser for the controller
The aperture of line frequency and described electric expansion valve is controlled.
The control device of air-conditioning system liquid impact prevention according to embodiments of the present invention, detects compressor by temperature detector
The surface temperature such as medium temperature of surface temperature such as bottom temp and condenser, and then controller is according to the surface of compressor
The surface temperature of temperature and condenser is controlled to the running frequency of compressor and the aperture of electric expansion valve, so that pressure
The coolant quantity of contracting machine output and the exchange capability of heat Proper Match of evaporimeter, thus avoiding evaporator evaporation insufficient and then being back to
The a large amount of liquid refrigerants of compressor, can avoid compressor that liquid hammer occurs, and then protect the compressor against damage, extend air-conditioning system
Service life.
Wherein, in some embodiments of the invention, described temperature detector is additionally operable to detect the bottom of described compressor
Temperature and the middle portion temperature of described condenser.
Further, in some embodiments of the invention, described controller is additionally operable to the bottom temperature in described compressor
When the temperature difference of the middle portion temperature of degree and described condenser meets the first default protective condition, control the running frequency of described compressor
Drop to first frequency, and control the aperture of described electric expansion valve to be decreased to the first aperture, or, at the bottom of described compressor
When the temperature difference of the middle portion temperature of portion's temperature and described condenser meets the second default protective condition, control the operation of described compressor
Frequency drops to second frequency, and controls the aperture of described electric expansion valve to reduce with first rate, or, in described compressor
Bottom temp and the temperature difference of middle portion temperature of described condenser when meeting the 3rd default protective condition, control described compressor
Running frequency is constant, and controls the aperture of described electric expansion valve to reduce with the second speed, and wherein, described second frequency is more than institute
State first frequency, described second speed is less than described first rate.
Wherein, in some embodiments of the invention, described controller is additionally operable under the running frequency of described compressor
Be down to described first frequency and described electric expansion valve aperture be decreased to described first aperture Preset Time after, and described pressure
The temperature difference of the middle portion temperature of the bottom temp of contracting machine and described condenser still meets the described first default protective condition, then control institute
State compressor out of service.
Wherein, in some embodiments of the invention, described controller is additionally operable to controlling opening of described electric expansion valve
When degree reduces with described first rate or control the aperture of described electric expansion valve to reduce with described second speed, judge described pressure
The temperature difference of the middle portion temperature of the bottom temp of contracting machine and described condenser increases, then control described electric expansion valve to keep currently opening
Degree.
Specifically, the described first default protective condition is -8 DEG C≤Δ T≤0 DEG C, and the described second default protective condition is 0 DEG C
<Δ T≤A DEG C, the described 3rd default protective condition is A DEG C<Δ T≤B DEG C, wherein, Δ T be described compressor bottom temp and
The temperature difference of the middle portion temperature of described condenser, A<B.
Wherein, described A can be 2-3 DEG C, and described B can be 4-5 DEG C.
For reaching above-mentioned purpose, another aspect of the invention embodiment proposes a kind of air-conditioning system, and this air-conditioning system includes
The control device of the air-conditioning system liquid impact prevention of above-described embodiment.
Air-conditioning system according to embodiments of the present invention, by the control device of above-mentioned air-conditioning system liquid impact prevention, can avoid
There is liquid hammer, prevent compressor from damaging because of liquid hammer, the service life of air-conditioning system extends.
The aspect that the present invention adds and advantage will be set forth in part in the description, and partly will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description
The above-mentioned and/or additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and easy to understand, wherein：
Fig. 1 is the flow chart of the control method of the air-conditioning system liquid impact prevention according to one embodiment of the present of invention；
Fig. 2 is the control device of air-conditioning system liquid impact prevention and showing of air-conditioning system according to an alternative embodiment of the invention
It is intended to；And
Fig. 3 is the block diagram of the air-conditioning system of another embodiment according to the present invention.
Reference
The control device 200 of the anti-press of air-conditioning system 100, air-conditioning system, compressor 10, condenser 20, electric expansion valve
30th, temperature detector 40.
Specific embodiment
Embodiments of the invention are described below in detail, the example of described embodiment is shown in the drawings, wherein from start to finish
The element that same or similar label represents same or similar element or has same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
Following disclosure provides many different embodiments or example for realizing the different structure of the present invention.For letter
Change disclosure of the invention, hereinafter the part and setting of specific examples is described.Certainly, they are only merely illustrative, and
Purpose does not lie in the restriction present invention.Additionally, the present invention can in different examples repeat reference numerals and/or letter.This heavy
It is for purposes of simplicity and clarity again, itself do not indicate the relation between discussed various embodiment and/or setting.This
Outward, the invention provides various specific technique and material example, but those of ordinary skill in the art can be appreciated that
The applicable property of other techniques and/or the use of other materials.In addition, fisrt feature described below second feature it
" on " structure can include the first and second features and be formed as the embodiment of directly contact it is also possible to include other feature shape
Become the embodiment between the first and second features, such first and second features may not be directly contact.
In describing the invention, it should be noted that unless otherwise prescribed and limit, term " installation ", " being connected ",
" connection " should be interpreted broadly, for example, it may be the connection of mechanical connection or electrical connection or two element internals, can
To be to be joined directly together it is also possible to be indirectly connected to by intermediary, for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term.
With reference to explained below and accompanying drawing it will be clear that these and other aspects of embodiments of the invention.In these descriptions
In accompanying drawing, specifically disclose some particular implementation in embodiments of the invention, to represent the enforcement implementing the present invention
Some modes of the principle of example are but it is to be understood that the scope of embodiments of the invention is not limited.On the contrary, the present invention
Embodiment includes falling into all changes in the range of the spirit of attached claims and intension, modification and equivalent.
The control method of air-conditioning system liquid impact prevention proposing according to embodiments of the present invention and control are described with reference to the accompanying drawings
Device, and there is the air-conditioning system of this control device.
First the control method of the air-conditioning system liquid impact prevention of one aspect of the present invention embodiment is illustrated.Wherein, air-conditioning
System includes compressor, condenser and electric expansion valve.Fig. 1 is the air-conditioning system liquid impact prevention according to one embodiment of the present of invention
Control method flow chart.
As shown in figure 1, the control method of the air-conditioning system liquid impact prevention of the embodiment of the present invention comprises the following steps：
S1, the detection surface temperature of compressor and the surface temperature of condenser respectively.
For example, temperature-sensitive bag is connected by the surface of compressor and the surface of condenser, compression is perceived respectively by temperature-sensitive bag
Machine surface and the temperature of condenser surface.
S2, the surface temperature according to compressor and the temperature difference of the surface temperature of condenser are to the running frequency of compressor and electricity
The aperture of sub- expansion valve is controlled.
Specifically, may determine that the liquid refrigerants amount of compressor according to the surface temperature of compressor, according to the table of condenser
Face temperature may determine that the exchange capability of heat of condenser, understands output to the coolant quantity of electric expansion valve, and then according to compressor
The temperature difference of the surface temperature of surface temperature and condenser is adjusted to the running status of air-conditioning system, that is, adjusts compressor
Running frequency and electric expansion valve aperture so that compressor output coolant quantity and export to the coolant quantity of evaporimeter
And the exchange capability of heat Proper Match of evaporimeter is so that evaporimeter can evaporate completely, it is to avoid evaporation is insufficient, causes a large amount of liquid
State refrigerant return, to compressor, leads to compressor that liquid hammer occurs, in turn results in compressor damage.
Specifically, when detecting the surface temperature of compressor, multiple temperature spots of compressor can be detected, real in the present invention
Apply the bottom temp that can detect compressor in the control method of example, for example, detect compressor bottom sides, muffler right opposite
Position temperature, and detection condenser middle portion temperature.
The operation frequency to compressor by the temperature difference of the middle portion temperature to the bottom temp according to compressor and condenser below
The aperture of rate and electric expansion valve is controlled being described in detail.
Specifically, if the temperature difference of the middle portion temperature of the bottom temp of compressor and condenser meets the first default ceiling
Part, then control the running frequency of compressor to drop to first frequency, and control the aperture of electric expansion valve to be decreased to the first aperture.
For example, the first default protective condition can be -8 DEG C≤Δ T≤0 DEG C, and wherein, Δ T is bottom temp and the condenser of compressor
Middle portion temperature the temperature difference.That is, meeting it is believed that compressor output coolant quantity is excessive during -8 DEG C≤Δ T≤0 DEG C,
Mismatch with the exchange capability of heat of evaporimeter, the snow kind being now back to compressor assumes liquid, easily causes compressor liquid hammer, then
Compressor is controlled directly to run according to the low-limit frequency that first frequency such as compressor allows, to reduce the refrigerant of compressor output
Amount, controls the aperture of electric expansion valve to be set to the minimum aperture that the first aperture such as electric expansion valve allows, to ensure simultaneously
Evaporimeter can evaporate fully.
Wherein, drop to first frequency in the running frequency controlling compressor and control the aperture of electric expansion valve to be decreased to
First aperture Preset Time such as 30 minutes afterwards, if the temperature difference of the middle portion temperature of the bottom temp of compressor and condenser is still
Meet the first default protective condition, in other words, the coolant quantity of now compressor output is still mated with the exchange capability of heat of evaporimeter
Unreasonable, then control compressor out of service.
Be exemplified below, for example, for air-conditioning system A type, when air-conditioning system brings into operation, outside temperature
For 21 DEG C, outside temperature is 18 DEG C, runs the low wind that freezes, the running frequency of compressor is 80Hz, the aperture of electric expansion valve
For 250PPS, when bringing into operation, the bottom temp of compressor is for example set to Td for 28.5 DEG C, and the medium temperature of condenser for example sets
It is 37.4 DEG C for Tz, △ T=8.9, reduces indoor motor speed, evaporating temperature reduces, and with system operation, Tz is changed into 27.2
Degree, Td is changed into 26.1 degree, △ T=-1.1 degree, and the snow kind being now back to compressor presents liquid, the possibility of liquid hammer
Property, now need to control the running frequency of compressor to be adjusted to first frequency such as low-limit frequency 15Hz at once, control electricity simultaneously
Sub- expansion valve opening runs to 80PPS, if still meeting -8 DEG C≤Δ T≤0 DEG C after 30 minutes, forces compressor to be shut down
Process.
If the temperature difference of the medium temperature of the bottom temp of compressor and condenser is not at the above-mentioned first default ceiling
In the range of part, further, if the temperature difference of the middle portion temperature of the bottom temp of compressor and condenser meets the second default guarantor
Guard strip part, it is believed that the snow kind being now back to compressor assumes liquid trend, there is a possibility that liquid hammer, then controls
The running frequency of compressor drops to second frequency, and controls the aperture of electric expansion valve to reduce with first rate, defeated to reduce
Enter the coolant quantity in evaporimeter, reduce the evaporating loads of evaporimeter.Wherein, second frequency is more than first frequency.For example, second
Default protective condition can be 0 DEG C<Δ T≤A DEG C, specifically, such as A can be 2-3 DEG C.
Be exemplified below, for example, for air-conditioning system B type, 21 DEG C of indoor temperature, outside temperature 18
DEG C, run the low wind that freezes, the running frequency of compressor is 70Hz, and electronic expansion valve opening is 320PPS, and when bringing into operation, Tz is
27.5 DEG C, Td is 34.1 DEG C, △ T=6.6；Reduce indoor motor speed, evaporating temperature reduces, with the fortune of air-conditioning system
OK, Tz is changed into 27.0 DEG C, and Td is changed into 30.8 DEG C, T=2.8 DEG C of △, meets the second default protective condition it is believed that now flowing back
Snow kind to compressor tends to liquid, has the possibility that liquid hammer occurs, then control the running frequency of compressor to adjust low one grade i.e.
It is reduced to second frequency such as 65Hz, control electronic expansion valve opening to reduce for example according to 20 steps per second with first rate simultaneously
Speed is closed, when the aperture controlling electric expansion valve is reduced with first rate, if the bottom temp of compressor and condenser
The temperature difference of middle portion temperature increased, then control electric expansion valve to keep current aperture, briefly, if being back to compression
The state of the refrigerant of machine has improvement then will keep current state, if no improvement, the bottom temp of compressor and cold
The temperature difference of the medium temperature of condenser continues to reduce, if meeting -8 DEG C≤Δ T≤0 DEG C, controls the running frequency of compressor to continue
Continuous reduction, until low-limit frequency such as 15Hz, controls the aperture of electric expansion valve to run to 80PPS simultaneously, if after 30 minutes,
It is still within the range of the first default protective condition, then controlling air-conditioning system to do shutdown and processing.
In addition, if the temperature difference of the medium temperature through judging the bottom temp of compressor and condenser is not at above-mentioned the
In one default protective condition and the second default protective condition, further, if in the bottom temp and condenser of compressor
The temperature difference of portion's temperature meets the 3rd default protective condition it is believed that the snow kind being now back to compressor assumes liquid trend,
There is a possibility that liquid hammer, then control the running frequency of compressor constant, and control the aperture of electric expansion valve with second
Speed reduces, and wherein, the second speed is less than first rate.3rd default protective condition is A DEG C<Δ T≤B DEG C, wherein, A<B, example
As B can be 4-5 DEG C.
Be exemplified below, for example, for air-conditioning system C type, 21 DEG C of indoor temperature, outside temperature 18
DEG C, run low wind pattern of freezing, the running frequency of compressor is 80Hz, and the aperture of electric expansion valve is 240PPS, brings into operation
When Tz be 28.1 DEG C, Td be 34.5 DEG C, T=6.4 DEG C of △.Reduce indoor motor speed, evaporating temperature reduces, with air-conditioning system
The operation of system, Tz is changed into 27.0 DEG C, and Td is changed into 31.8 degree, T=4.8 DEG C of △, meets the 3rd default protective condition, now back pressure contracting
The snow kind of machine tends to liquid, occurs the possibility of liquid hammer, then control the running frequency of compressor to keep constant, and control electronics
Expansion valve opening for example turns down according to the speed of 10 steps/second so that the second speed is less.In the aperture controlling described electric expansion valve
When being reduced with described second speed, if the temperature difference of the middle portion temperature of the bottom temp of compressor and condenser increases, control
Electric expansion valve keeps current aperture.Briefly, if now △ T can improve lifting temperature, keep current state
Run, if △ T drops to 0 DEG C<In the range of Δ T≤A DEG C, then control the running frequency of compressor to be reduced to second frequency and adjust
Whole low one grade of such as 75Hz, and control electronic expansion valve opening for example to close according to the speed of 20 steps per second so that first rate is less
Close.If the state being back to the refrigerant of compressor has improvement, current state will be kept, if no improvement, compression
The temperature difference of the medium temperature of the bottom temp of machine and condenser continues to reduce, if meeting -8 DEG C≤Δ T≤0 DEG C, controls pressure
The running frequency of contracting machine continues to reduce, until low-limit frequency such as 15Hz, control simultaneously electronic expansion valve opening run to
80PPS.If after 30 minutes, it is still within the range of the first default protective condition, then controlling air-conditioning system to do shutdown and processing.
In sum, the control method of air-conditioning system liquid impact prevention according to embodiments of the present invention, by detecting compressor
The surface temperature such as medium temperature of surface temperature such as bottom temp and condenser, so the surface temperature according to compressor and
The surface temperature of condenser is controlled to the running frequency of compressor and the aperture of electric expansion valve, so that compressor is defeated
The coolant quantity going out and the exchange capability of heat Proper Match of evaporimeter, thus avoiding evaporator evaporation insufficient and then being back to compressor
A large amount of liquid refrigerants, so that compressor avoids liquid hammer, and then protect the compressor against damage, extend air-conditioning system
Service life.
A kind of control of air-conditioning system liquid impact prevention that embodiment proposes according to a further aspect of the invention is described with reference to the accompanying drawings
Device processed.
Fig. 2 is the signal of the control device of air-conditioning system according to one embodiment of the present of invention and air-conditioning system liquid impact prevention
Figure.Wherein, air-conditioning system includes compressor 10, condenser 20 and electric expansion valve 30, and other institutes such as evaporimeter, cross valve
The part of the cooling and warming circulation needing.As shown in Fig. 2 the control device of the air-conditioning system liquid impact prevention of the embodiment of the present invention includes temperature
Degree detector 40 and controller (in figure does not indicate).
Wherein, temperature detector 40 (40 (A) in Fig. 2 and 40 (B)) detects the surface temperature of compressor 10 and cold respectively
The surface temperature of condenser 20, such as shown in Fig. 2 connecting temperature-sensitive respectively on the surface of the surface of compressor 10 and condenser 20
Bag, temperature-sensitive bag 40 (A) detects the surface temperature of compressor 10, and temperature-sensitive bag 40 (B) detects the surface temperature of condenser 20.
And then controller according to the temperature difference of the surface temperature of compressor 10 and the surface temperature of condenser 20 to compressor 10
Running frequency and the aperture of electric expansion valve 30 be controlled.Specifically, controller can be according to the surface temperature of compressor 10
Degree judges the liquid refrigerants amount of compressor 10, may determine that the exchange capability of heat of condenser 20 according to the surface temperature of condenser 20,
Understand output to the coolant quantity of electric expansion valve 30, and then the table of the surface temperature according to compressor 10 for the controller and condenser 20
The temperature difference of face temperature is adjusted to the running status of air-conditioning system, that is, adjusts the running frequency of compressor 10 and electronics is swollen
The aperture of swollen valve 30 so that compressor 10 output coolant quantity and export to the coolant quantity of evaporimeter and changing of evaporimeter
Heat energy power Proper Match is so that evaporimeter can evaporate completely, it is to avoid evaporation is insufficient, causes a large amount of liquid refrigerants to be back to pressure
Contracting machine 10, leads to compressor 10 that liquid hammer occurs, in turn results in compressor 10 and damage.
Specifically, when detecting the surface temperature of compressor, compressor 10 can be detected by temperature detector 40 more
Individual temperature spot, the control device of the embodiment of the present invention, temperature detector 40 detects the bottom temp of compressor 10, such as Fig. 2
Shown, the bottom sides of detection compressor 10, the temperature of the position of muffler right opposite, and the middle part temperature of detection condenser 20
Degree.
Below by controller according to the temperature difference of the bottom temp of compressor and the middle portion temperature of condenser to compressor
The aperture of running frequency and electric expansion valve is controlled being described in detail.
Specifically, the temperature difference in the bottom temp of compressor 10 and the middle portion temperature of condenser 20 meets the first default protection
During condition, controller controls the running frequency of compressor 10 to drop to first frequency, and controls the aperture of electric expansion valve 30 to subtract
Little to the first aperture.For example, the first default protective condition can be -8 DEG C≤Δ T≤0 DEG C, and wherein, Δ T is the bottom of compressor 10
The temperature difference of the middle portion temperature of portion's temperature and condenser 20.That is, meeting during -8 DEG C≤Δ T≤0 DEG C it is believed that compressor
10 output coolant quantities are excessive, mismatch with the exchange capability of heat of evaporimeter, the snow kind being now back to compressor 10 assumes liquid, hold
Easily cause compressor 10 liquid hammer, controller then controls compressor 10 directly minimum according to first frequency such as compressor 10 permission
Frequency is run, and to reduce the coolant quantity of compressor 10 output, controls the aperture of electric expansion valve 30 to be set to the first aperture simultaneously
The minimum aperture that for example electric expansion valve 30 allows, to ensure that evaporimeter can evaporate fully.
Wherein, the running frequency in compressor 10 drops to first frequency and the aperture of electric expansion valve 30 is decreased to first
Aperture Preset Time such as 30 minutes afterwards, if the temperature difference of the middle portion temperature of the bottom temp of compressor 10 and condenser 20 is still
Meet the first default protective condition, in other words, the coolant quantity of now compressor 10 output and the exchange capability of heat of evaporimeter are still
Join unreasonable, then controller controls compressor 10 out of service.
If it is above-mentioned that controller judges that the temperature difference of the bottom temp of compressor 10 and the medium temperature of condenser 20 is not at
In the range of first default protective condition, further, in the temperature of the bottom temp of compressor 10 and the middle portion temperature of condenser 20
Difference meets during the second default protective condition it is believed that the snow kind being now back to compressor assumes liquid trend, there is appearance
The possibility of liquid hammer, then controller control the running frequency of compressor 10 to drop to second frequency, and control electric expansion valve 30
Aperture reduced with first rate, to reduce the coolant quantity in evaporimeter in input, reduce the evaporating loads of evaporimeter.Wherein,
Second frequency is more than first frequency, and for example, the second default protective condition can be 0 DEG C<Δ T≤A DEG C, specifically, for example A is permissible
For 2-3 DEG C.
In addition, if controller judges that the bottom temp of compressor 10 and the temperature difference of the medium temperature of condenser 20 are not at
In above-mentioned first default protective condition and the second default protective condition, further, in bottom temp and the condensation of compressor 10
The temperature difference of the middle portion temperature of device 20 meets during the 3rd default protective condition it is believed that the snow kind being now back to compressor 10 is in
Existing liquid trend, there is a possibility that liquid hammer, then controller controls the running frequency of compressor 10 constant, and controls electronics
The aperture of expansion valve 30 is reduced with the second speed, and wherein, the second speed is less than first rate.3rd default protective condition is A DEG C<
Δ T≤B DEG C, wherein, A<B, such as B can be 4-5 DEG C.
Be exemplified below, for example, for air-conditioning system C type, 21 DEG C of indoor temperature, outside temperature 18
DEG C, run low wind pattern of freezing, the running frequency of compressor 10 is 80Hz, the aperture of electric expansion valve 30 is 240PPS, starts
During operation, the middle portion temperature of condenser 10 is for example set to Tz for 28.1 DEG C, and it is 34.5 that the bottom temp of compressor 10 is for example set to Td
DEG C, T=6.4 DEG C of △.Reduce indoor motor speed, evaporating temperature reduces, and with the operation of air-conditioning system, Tz is changed into 27.0
DEG C, Td is changed into 31.8 degree, T=4.8 DEG C of △, meets the 3rd default protective condition, and the snow kind now returning compressor tends to liquid, has
The possibility of liquid hammer occurs, then controller controls the running frequency of compressor 10 to keep constant, and controls electric expansion valve 30
Aperture for example turns down according to the speed of 10 steps/second so that the second speed is less.Controlling the aperture of electric expansion valve 30 with described the
When two speed reduce, if controller judges that the bottom temp of compressor 10 and the temperature difference of the middle portion temperature of condenser 20 increase,
Electric expansion valve 30 is then controlled to keep current aperture.Briefly, if now △ T can improve lifting temperature, keep mesh
Front state is run, if △ T drops to 0 DEG C<In the range of Δ T≤A DEG C, then controller controls the running frequency fall of compressor 10
As little as second frequency adjusts low one grade of such as 75Hz, and control electric expansion valve 30 aperture with first rate less for example according to
The speed of 20 steps per second is closed.Controller control electric expansion valve 30 aperture reduced with first rate when, if controller
Judge that the bottom temp of compressor 10 and the temperature difference of the middle portion temperature of condenser 20 have increased, then control electric expansion valve 30 to protect
Hold current aperture.If that is, the state being back to the refrigerant of compressor 10 has improvement, current state will be kept,
If no improvement, the temperature difference of the medium temperature of the bottom temp of compressor 30 and condenser 20 continues to reduce, if meet-
8 DEG C≤Δ T≤0 DEG C, then the running frequency continuation of controller control compressor 10 reduces, until low-limit frequency such as 15Hz, with
When controller control electric expansion valve 30 aperture run to 80PPS.If after 30 minutes, the bottom temp of compressor 10 and condensation
The temperature difference of the middle portion temperature of device 20 is still within the range of the first default protective condition, then controller controls air-conditioning system to shut down
Process.
The control device of air-conditioning system liquid impact prevention according to embodiments of the present invention, detects compressor by temperature detector
The surface temperature such as medium temperature of surface temperature such as bottom temp and condenser, and then controller is according to the surface of compressor
The surface temperature of temperature and condenser is controlled to the running frequency of compressor and the aperture of electric expansion valve, so that pressure
The coolant quantity of contracting machine output and the exchange capability of heat Proper Match of evaporimeter, thus avoiding evaporator evaporation insufficient and then being back to
The a large amount of liquid refrigerants of compressor, can protect compressor to avoid liquid hammer, and then avoids compressor to cause to damage because of liquid hammer, prolong
The service life of long air-conditioning system.
Another aspect of the invention embodiment also proposes a kind of air-conditioning system.Fig. 3 is according to one embodiment of the present of invention
Air-conditioning system block diagram.
As shown in figure 3, the air-conditioning system 100 of the embodiment of the present invention includes the air-conditioning system liquid impact prevention of above-described embodiment proposition
Control device 200.
Air-conditioning system according to embodiments of the present invention, by the control device of above-mentioned air-conditioning system liquid impact prevention, can avoid
There is liquid hammer, prevent compressor from damaging because of liquid hammer, the service life of air-conditioning system extends.
In flow chart or here any process described otherwise above or method description are construed as, represent and include
The module of the code of executable instruction of one or more steps for realizing specific logical function or process, fragment or portion
Point, and the scope of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discuss suitable
Sequence, including according to involved function by substantially simultaneously in the way of or in the opposite order, carry out perform function, this should be by the present invention
Embodiment person of ordinary skill in the field understood.
Represent in flow charts or here logic described otherwise above and/or step, for example, it is possible to be considered as to use
In the order list of the executable instruction realizing logic function, may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (system as computer based system, including processor or other can hold from instruction
Row system, device or equipment instruction fetch the system of execute instruction) use, or with reference to these instruction execution systems, device or set
Standby and use.For the purpose of this specification, " computer-readable medium " can any can be comprised, store, communicate, propagate or pass
Defeated program is for instruction execution system, device or equipment or the dress using with reference to these instruction execution systems, device or equipment
Put.The more specifically example (non-exhaustive list) of computer-readable medium includes following：There is the electricity of one or more wirings
Connecting portion (electronic installation), portable computer diskette box (magnetic device), random access memory (RAM), read-only storage
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, computer-readable medium can even is that the paper that can print described program thereon or other are suitable
Medium, because edlin, interpretation or if necessary with it can then be entered for example by carrying out optical scanner to paper or other media
His suitable method is processed to electronically obtain described program, is then stored in computer storage.
It should be appreciated that each several part of the present invention can be realized with hardware, software, firmware or combinations thereof.Above-mentioned
In embodiment, the software that multiple steps or method can be executed in memory and by suitable instruction execution system with storage
Or firmware is realizing.For example, if realized with hardware, and the same in another embodiment, can use well known in the art under
Any one of row technology or their combination are realizing：There is the logic gates for data-signal is realized with logic function
Discrete logic, there is the special IC of suitable combinational logic gate circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that to realize all or part step that above-described embodiment method carries
Suddenly the program that can be by completes come the hardware to instruct correlation, and described program can be stored in a kind of computer-readable storage medium
In matter, this program upon execution, including one or a combination set of the step of embodiment of the method.
Additionally, can be integrated in a processing module in each functional unit in each embodiment of the present invention it is also possible to
It is that unit is individually physically present it is also possible to two or more units are integrated in a module.Above-mentioned integrated mould
Block both can be to be realized in the form of hardware, it would however also be possible to employ the form of software function module is realized.Described integrated module is such as
Fruit using in the form of software function module realize and as independent production marketing or use when it is also possible to be stored in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only storage, disk or CD etc..
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy describing with reference to this embodiment or example
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.And, the specific features of description, structure, material or feature can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, permissible
Understand and can carry out multiple changes, modification, replacement to these embodiments without departing from the principles and spirit of the present invention
And modification, the scope of the present invention by claims and its equivalent limits.
Claims (17)
1. a kind of control method of air-conditioning system liquid impact prevention it is characterised in that described air-conditioning system include compressor, condenser and
Electric expansion valve, described control method comprises the following steps：
Detect the surface temperature of described compressor and the surface temperature of described condenser respectively；And
The operation frequency to described compressor for the temperature difference of the surface temperature of the surface temperature according to described compressor and described condenser
The aperture of rate and described electric expansion valve is controlled.
2. the control method of air-conditioning system liquid impact prevention as claimed in claim 1 is it is characterised in that described detect described pressure respectively
The surface temperature of contracting machine and the surface temperature of described condenser, specifically include：
Detect the bottom temp of described compressor, and the middle portion temperature detecting described condenser.
3. the control method of air-conditioning system liquid impact prevention as claimed in claim 2 is it is characterised in that the described bottom according to compressor
The temperature difference of the middle portion temperature of portion's temperature and described condenser is to the running frequency of described compressor and opening of described electric expansion valve
Degree is controlled, and specifically includes：
If the temperature difference of the middle portion temperature of the bottom temp of described compressor and described condenser meets the first default protective condition,
The running frequency then controlling described compressor drops to first frequency, and controls the aperture of described electric expansion valve to be decreased to first
Aperture.
4. the control method of air-conditioning system liquid impact prevention as claimed in claim 3 is it is characterised in that also include：
Drop to described first frequency in the running frequency controlling described compressor and control the aperture of described electric expansion valve to subtract
After little to described first aperture Preset Time, if the middle portion temperature of the bottom temp of described compressor and described condenser
The temperature difference still meets the described first default protective condition, then control described compressor out of service.
5. the control method of air-conditioning system liquid impact prevention as claimed in claim 4 is it is characterised in that also include：
If the temperature difference of the middle portion temperature of the bottom temp of described compressor and described condenser meets the second default protective condition,
The running frequency then controlling described compressor drops to second frequency, and controls the aperture of described electric expansion valve with first rate
Reduce, wherein, described second frequency is more than described first frequency.
6. the control method of air-conditioning system liquid impact prevention as claimed in claim 5 is it is characterised in that also include：
If the temperature difference of the middle portion temperature of the bottom temp of described compressor and described condenser meets the 3rd default protective condition,
Then control the running frequency of described compressor constant, and control the aperture of described electric expansion valve to reduce with the second speed, wherein,
Described second speed is less than described first rate.
7. the control method of air-conditioning system liquid impact prevention as claimed in claim 6 is it is characterised in that also include：
The aperture controlling described electric expansion valve reduced with described first rate or control the aperture of described electric expansion valve with
When described second speed reduces, if the temperature difference of the middle portion temperature of the bottom temp of described compressor and described condenser increases,
Described electric expansion valve is then controlled to keep current aperture.
8. the control method of air-conditioning system liquid impact prevention as claimed in claim 6 is it is characterised in that described first presets ceiling
Part is -8 DEG C≤Δ T≤0 DEG C, and the described second default protective condition is 0 DEG C<Δ T≤2 DEG C, the described 3rd default protective condition is 2
℃<Δ T≤5 DEG C, wherein, Δ T is the temperature difference of the middle portion temperature of the bottom temp of described compressor and described condenser.
9. the control method of air-conditioning system liquid impact prevention as claimed in claim 6 is it is characterised in that described first presets ceiling
Part is -8 DEG C≤Δ T≤0 DEG C, and the described second default protective condition is 0 DEG C<Δ T≤3 DEG C, the described 3rd default protective condition is 3
℃<Δ T≤5 DEG C, wherein, Δ T is the temperature difference of the middle portion temperature of the bottom temp of described compressor and described condenser.
10. a kind of control device of air-conditioning system liquid impact prevention is it is characterised in that described air-conditioning system includes compressor, condenser
And electric expansion valve, described control device includes：
Temperature detector, described temperature detector detects the surface temperature of described compressor and the surface temperature of described condenser respectively
Degree；
Controller, described controller is according to the surface temperature of described compressor and the surface temperature of described condenser to described compression
The aperture of the running frequency of machine and described electric expansion valve is controlled.
The control device of 11. air-conditioning system liquid impact prevention as claimed in claim 10 it is characterised in that described temperature detector also
For detecting the bottom temp of described compressor and the middle portion temperature of described condenser.
The control device of 12. air-conditioning system liquid impact prevention as claimed in claim 11 it is characterised in that
The temperature difference that described controller is additionally operable to the middle portion temperature in the bottom temp of described compressor and described condenser meets the
During one default protective condition, control the running frequency of described compressor to drop to first frequency, and control described electric expansion valve
Aperture be decreased to the first aperture, or, in the temperature difference of the bottom temp of described compressor and the middle portion temperature of described condenser
When meeting the second default protective condition, control the running frequency of described compressor to drop to second frequency, and control described electronics
The aperture of expansion valve is reduced with first rate, or, in the bottom temp of described compressor and the middle portion temperature of described condenser
Temperature difference when meeting the 3rd default protective condition, control the running frequency of described compressor constant, and control described electronic expansion
The aperture of valve is reduced with the second speed, and wherein, described second frequency is more than described first frequency, and described second speed is less than described
First rate.
The control device of 13. air-conditioning system liquid impact prevention as claimed in claim 12 is it is characterised in that described controller is additionally operable to
Drop to described first frequency in the running frequency of described compressor and the aperture of described electric expansion valve is decreased to described first
After aperture Preset Time, and the temperature difference of the middle portion temperature of the bottom temp of described compressor and described condenser still meet described
First default protective condition, then control described compressor out of service.
The control device of 14. air-conditioning system liquid impact prevention as claimed in claim 12 is it is characterised in that described controller is additionally operable to
Reduced with described first rate in the aperture controlling described electric expansion valve or control the aperture of described electric expansion valve with described
When second speed reduces, judge that the bottom temp of described compressor and the temperature difference of the middle portion temperature of described condenser increase, then control
Make described electric expansion valve and keep current aperture.
The control device of 15. air-conditioning system liquid impact prevention as claimed in claim 12 is it is characterised in that described first presets protection
Condition is -8 DEG C≤Δ T≤0 DEG C, and the described second default protective condition is 0 DEG C<Δ T≤2 DEG C, the described 3rd default protective condition
For 2 DEG C<Δ T≤5 DEG C, wherein, Δ T is the temperature difference of the middle portion temperature of the bottom temp of described compressor and described condenser.
The control device of 16. air-conditioning system liquid impact prevention as claimed in claim 12 is it is characterised in that described first presets protection
Condition is -8 DEG C≤Δ T≤0 DEG C, and the described second default protective condition is 0 DEG C<Δ T≤3 DEG C, the described 3rd default protective condition
For 3 DEG C<Δ T≤5 DEG C, wherein, Δ T is the temperature difference of the middle portion temperature of the bottom temp of described compressor and described condenser.
A kind of 17. air-conditioning systems are it is characterised in that include the air-conditioning system liquid impact prevention described in any one of claim 10-16
Control device.
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| CN201410334959.9A CN104132423B (en) | 2014-07-14 | 2014-07-14 | Control method and control device for liquid impact prevention for air conditioning system and air conditioning system |
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| CN201410334959.9A CN104132423B (en) | 2014-07-14 | 2014-07-14 | Control method and control device for liquid impact prevention for air conditioning system and air conditioning system |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105508201B (en) * | 2015-11-30 | 2017-06-27 | 广东美的暖通设备有限公司 | The control method of heat tape, controller and control system in compressor of air conditioner |
| CN106440236B (en) * | 2016-10-24 | 2019-02-22 | 邯郸美的制冷设备有限公司 | Return control method, control system and the air conditioner of liquid defencive function |
| CN108397868A (en) * | 2018-01-30 | 2018-08-14 | 青岛海尔空调器有限总公司 | Control method and air-conditioning for air-conditioning system liquid impact prevention |
| CN108548242B (en) * | 2018-03-30 | 2021-01-29 | 青岛海尔空调器有限总公司 | Control method and device of air conditioning system |
| CN110360779B (en) * | 2019-07-14 | 2021-07-06 | 南京创维家用电器有限公司 | Liquid impact prevention protection control method for air-cooled refrigerator compressor |
| CN112833522A (en) * | 2019-11-22 | 2021-05-25 | 三花控股集团有限公司 | Control system and control method thereof |
| CN113446702B (en) * | 2020-03-26 | 2023-05-26 | 青岛海尔空调电子有限公司 | Refrigerant flow control method and system for air conditioner |
| CN111426009B (en) * | 2020-04-03 | 2021-06-18 | 广东美的暖通设备有限公司 | Control method of air conditioning system, air conditioning system and computer storage medium |
| CN111473499A (en) * | 2020-04-29 | 2020-07-31 | 广东美的暖通设备有限公司 | Air conditioning system, control method and device thereof and storage medium |
| CN113970205B (en) * | 2021-10-27 | 2023-03-14 | 珠海格力电器股份有限公司 | Liquid-impact-prevention control system of liquid storage tank |
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| CN202056027U (en) * | 2011-04-27 | 2011-11-30 | 林勇 | Liquid impact prevention device for air-cooled heat pump air-conditioning compressor |
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